Gear-cutting machine.



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Patented Jan. 18, 1916.

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I I I I GEAR CUTTING MACHINE. APPLICATION FILED ILINE I, 1914. 1.169,@86.

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GEAR CUTTING MACHINE.

APPLICATION FILED JUNE 1, 19|4.

1,169,086, Patented Jan. 18, 1916.

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H. A. GARVEY.

GEAR CUTTING MACHINE.

APPLICATION FILED JUNE I, 1914.

Wah/fesses.

HENRY A. GAIWEY, or DETROIT, MICHIGAN, AssIGNoE To 'PACKARD' MOTOR CAE COMPANY, CE DETROIT, MICHIGAN, A CCEPCEATICN or MICHIGAN.

' GEAECUTTING MACHINE.

License.

To uZZ whom t may concern.'

Be it known that I, HENRY A. GARVEY, a citizen of the United States, and resident of Detroit, Wayne county, State of Michigan, have invented certain new and use'ful Improvements in Gear-Cutting Machines, of which the following is a specification.

This application is a division of application Serial No. 775,558, filed June 24, 1913.

rlhe present invention relates to gear cutting machines and more particularly to certain improvements whereby bevel gears having curved teeth are adapted to be cut on these machines.

One ofi the objects of the invention is to provide a simple, rigid construction for moving the tool accurately in a curved path.

Another object is to provide a construction which is not subject to excessive wear.

A further object is to provide an improved means for lifting the tool out of the tooth space on the return movement.

Other objects and the features of novelty will be apparent from the following description, taken in connection with the drawings, in 'which Figure 1 is a fragmentary plan view of the tool operating mechanism of a gear cutting machine embodying my improvements;` Fig. 2 is a front elevation of the same; Fig. 3 is an elevation of the left hand side of Fig. 2; Fig. 4 is a fragmentary section on the line 4 4 of Fig. 1; and Fig. 5 is an enlarged sectional view of the shaft for lifting thc tool on the return stroke.

.Referring to the drawings, indicates the bed of the machine on which slides a ram 11, suitable guides12 being provided for the ram. At its forward end the ram 11 carries a head 12 having a slide-way 13 for a tool support 14, the slide-way being arranged atright angles to the direction of movement of the ram. Any suitable means may be provided for securing the tool support 14 in the slide-way 13 and for this purpose I prefer to use the usual dove-tail on the tool support and form the slide-way to suit this dovetail, as indicated in dotted lines in Fig. 3. The tool support carries a rock shaft 15 which has secured thereto, bymeans of a pin 16, a tool holder 17. The tool holder 17 has a forwardly projecting arm 18 which carries the tool T and the arn1'18 is specification of'Letters Patent.

l in advance of the this application filed June 1,

arranged between suitable guides `19 on the tool support. The ram 11v carries a wrist pin 2O which 1s operatively connected with a crank pin 21 by means of a connecting rod 'lhe crank pm 21 is adjustably secured in any well known way in the transverse slot 23 in lthe end of the hub 24 of a driving wheel 25, this driving wheel being arranged on a driving shaft 26, which is supported in suitable bearings (not shown). f

For the purpose of guiding the tool T in the arc of a circle I arrange on one side of the tool support 14. ears 27 to whichl an arm or link 28 is connected as by means of a suit able pivot pin 29. The arm or link 28 is also vconnected with a normally vfixed pivot 30 which is arranged at one side of and slightly in Fig. 1. The vpivot, 30 is carried by ears 31 on a wedge block 32, this wedge block a suitable bracket secured to the frame 10.` ,Above the guide 33 is a guide 36 which engages the block 32 and is adapted to be clamped against the latter by means of screws 37. The guides 33' and 36 are arc shaped, as shown in Fig. 1, and have secured thereto the end plates 38 and 39 which carry adjusting screws 40 and 4l, respectively. Thesescrews engage the ends of the block 32 and are--for the purpose of adjusting the latter in the guides 33 and 36.

For the purpose of raising the tool out of the tooth space on the return stroke of the ram, I arrange on one end of the shaft 15 a finger 42 which is adapted to be engaged by a finger' 43 on a shaft 44. From the drawings it will be obvious that when the shaft 44 is rocked the finger 42 will be lifted and thus rock the shaft 15. The arm 18 of the tool holder 17 will be lifted by rocking the shaft 15 and thereby carry with it the tool T, to a sufficient height to lift the latter out Patented Janus', 191e.

Original application filed June 24, 1913, Serial No. 775,558. Divided and 1914. Serial No.842,144.

pivot 29, as clearly shown of the tooth space ofthe gear which is being cut, this gear being indicated in Fig. 3 at G, and being supported on a shaft G which is carried by the frame of the machine and moved by any suitable mechanism to generate the teeth, an illustration of such mechanism being shownin U. S.' Patent No. 665,054. The shaft 44 has one end n ried by thehead 12 of the ram. yThe gear 45 is held in position in the bearing 46 by means of a suitable collar 47 and meshes with a bevel gear 48,y which is also rotatably mounted in a suitable bearing in the head 12. The other endy of the shaft 44 is provided With .a recess "which receives a stud carried bythe tool support 14;

Owing to the sliding movement which the tool support 14 hasv relative to the head 12, it is necessary to spline the shaft 44 to the gear 45, and forthe purpose of connecting the shaft 44 With the stud 50 in such a manner as torpermit rotation of the shaft relative to the stud, I providey the recess 49 with annular grooves 51 and52 which are adapted to receive the ends of the pins 53 carried in suitable recesses 54'in the stud- 50. In order to hold the ends of the pins 53 in the grooves 51and k52, springs 55 are provided vin thek recesses back of the' pins 53. For the purpose of facilitating the removal-of the shaft 44`fro'm the stud 501 provide the shaft with openings 56 which communicate with the grooves 51 and 52, as shown in Fig. 5,

and permit the insertion of a device for pushing the ins 53 out of the grooves.

A, shaft 5 yis mountedl in a bearing 58 carried by the frame 10 and is splined in the gear 48. The shaft 57 carries a bevel gear 59 which meshes With a segmental bevel gear 60 arranged onjonearm of a rocking' Alever 61. The lever 61 is pivotally mounted at v62 on a suitable bracket 63 and carries a cam roller 64, which is arranged in a cam groove 65 in the side of the driving wheel 25. The cam groevey 65fis of such shape as to give the proper rocking movement to thefshaft 44 to lift the tool ,T out of the tooth space When ,they ram starts on its return stroke.

v "It will be seen that the mechanism for lifting the tool Aouti of the toothA` space isl comparatively simpleand does not interfere in any `Way with the operation of the tool support.

` In order to insure the return ofthe tool i. holder to thefproper position for the fory have Ward or cuttingstroke, I varrange on the arm 18 a laterally o projecting post 66 to which is connected one end of a spring 67, the other lend'of this spring' being secured to the 'post 68 on' the tool support.

For the purpose of effecting a relative adjustment of the pivotO and the blank supportl to thereby vary the angleofthe cut, I

block 32. VIt will be evident that the path of movement of the ytool will depend on the relation of kthepivot 3() to therpivot 29 and by shifting'the block 32 by'means of the screws 40 and 41the pivot 30 which is carriedy by theblock 32 tvvillbe adjusted relative to thepivot 29. When the pivot 30 is provided they means forl adjusting the in the proper position "the screws 37 are ,i

will move with it and the Whole support will therefore move in a curved path, the motion being one of pure translation.

, While I have shown and described what I now consider to be the preferred form of my invention, it Will be understood that various changes can be made in the details of construction within the scope0 of the claims,

portk 14 to move back and forthacross rThe parts carried by thetool ysupport 14 yso and therefore I do not Wish to be limited a to the exact details shownyand described;

Having thus described my invention, what f I claim and desire to secure-"by Letters Fatent isz- 1 k v 1. In a machine of the class described, the combination of a reciprocating head, aftool support carried by the head' and having a tool holder adapted to be lifted fromv the u'ork on the returnv stroke of the4 head, a

pair of meshing bevel gears carried by said head, means actuated 'by one of said gears `for lifting the toolholder, a shaft koperatively connected With the other ,bevely gear and alined therewith, a rocking lever," means for transmitting the movements to saidl shaft, and cam means operated in timed relation to the movements ofthe head for rocking said lever.

v 2.' In a machine ofthe class described, the combination of a reciprocating head, a tool support carried by said head and having ay rtool rholder adapted to be 'lifted from the workon the return stroke of the head, a pair of meshing gears carried by said head, means actuated by one ofsaidgears for liftingthe tool holder, a shaft operatively'connected 'i ywith the other bevelgear, arocking lever carried by the frame ofthemachine, means for rocking said leven 3. Ina machine of the elassdescribed, the combination of a reciprocating head, a tool support carriedk by said head. and having a gears, means whereby the 'tool holderis lifted by ay rockingy movement of said shaft`,'a second shaft supported on the' framejofthe iso iria for transmitting the movements of said lever' to said shaft, and cam means operated in timed relation tok the movements of the head ,shaft rotatably supported by said stub machine and having a sliding connection' combination of a reciprocating head, a tool support carried by said head and having a tool holder adapted to be lifted froml the work on the return stroke of the head, means for reciprocating the tool support transversely of the head, a pair of meshing bevel gears carried by the head, a shaft having one end supported on said tool support and its other end operatively connected with one of said gears, the shaft being slidable through said gear as the support is reciprocated on the head, means whereby the rocking of said shaft is adapted to lift the tool holder, and means for actuating theother of said bevel gears.

5. In a machine of the class described, the

combination .of a reciprocating head, a tool A support carried by said head and having atool holder adapted to be lifted from the work on the return stroke of the head, means for reciprocating the tool support on the head and means for lifting the tool holder comprising a stubshaft on the support, a shaft and movable with the support, an operating gear carried by the head and having a sliding connection with the second mentioned shaft, a cooperating means movable with the tool holder and the second mentioned 4. In a'machine of the class described, the.

shaft adapted to lift the tool holder when the second mentioned shaft is rocked.

6. In a machine of the class described, a tool support, a tool holder pivotally mounted thereon, a stub shaft carried by the tool support, a shaft carried by said stub shaft and rotatable thereon, coperating means on the tool holder and the second mentioned shaft for lifting the tool holder when the second mentioned shaft is rocked, and means for rocking the second mentioned shaft.

7. In a gear cutting machine, in combina tion, the frame or bed, a sliding ram thereon, means for operatingpit, a tool support mounted to slide transversely of said ram, a `pivoted tool holder on said support, and means for intermittently rasising said tool holder comprising sliding connections from said support to said ram and from the ram to the frame. v

8. Ina gear cutting machine, in combination, .the frame or bed, a sliding ram there- Ommeansr for operating it, a 15001 Support mounted to slide transversely of said ram, a pivoted tool holder on said support, and means for intermittently raising said tool holder comprising sliding connections from said support to said ram and from the ram to the frame, and gears between said sliding connections.

In testimony whereof I affix my signature in presence of Witnesses.

HENRY A. GARVEY. 

